Overhaul internal GSI error message buffer. #6575
Overhaul internal GSI error message buffer. #6575

This gives us more flexibility and efficiency in constructing GSI error
messages.

htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor